QwtMagnifier provides zooming, by magnifying in steps. More...

#include <qwt_magnifier.h>

Inheritance diagram for QwtMagnifier:

Public Member Functions
	QwtMagnifier (QWidget *)

virtual	~QwtMagnifier ()
	Destructor.

QWidget *	parentWidget ()

const QWidget *	parentWidget () const

void	setEnabled (bool)
	En/disable the magnifier. More...

bool	isEnabled () const

void	setMouseFactor (double)
	Change the mouse factor. More...

double	mouseFactor () const

void	setMouseButton (Qt::MouseButton, Qt::KeyboardModifiers=Qt::NoModifier)

void	getMouseButton (Qt::MouseButton &, Qt::KeyboardModifiers &) const

void	setWheelFactor (double)
	Change the wheel factor. More...

double	wheelFactor () const

void	setWheelModifiers (Qt::KeyboardModifiers)

Qt::KeyboardModifiers	wheelModifiers () const

void	setKeyFactor (double)
	Change the key factor. More...

double	keyFactor () const

void	setZoomInKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)

void	getZoomInKey (int &key, Qt::KeyboardModifiers &) const
	Retrieve the settings of the zoom in key. More...

void	setZoomOutKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)

void	getZoomOutKey (int &key, Qt::KeyboardModifiers &) const
	Retrieve the settings of the zoom out key. More...

virtual bool	eventFilter (QObject , QEvent )
	Event filter. More...

Protected Member Functions
virtual void	rescale (double factor)=0

virtual void	widgetMousePressEvent (QMouseEvent *)

virtual void	widgetMouseReleaseEvent (QMouseEvent *)

virtual void	widgetMouseMoveEvent (QMouseEvent *)

virtual void	widgetWheelEvent (QWheelEvent *)

virtual void	widgetKeyPressEvent (QKeyEvent *)

virtual void	widgetKeyReleaseEvent (QKeyEvent *)

Detailed Description

QwtMagnifier provides zooming, by magnifying in steps.

Using QwtMagnifier a plot can be zoomed in/out in steps using keys, the mouse wheel or moving a mouse button in vertical direction.

Constructor & Destructor Documentation

QwtMagnifier::QwtMagnifier ( QWidget * parent )

explicit

Constructor

Parameters

parent Widget to be magnified

Member Function Documentation

bool QwtMagnifier::eventFilter	(	QObject *	object,
		QEvent *	event
	)

virtual

Event filter.

When isEnabled() is true, the mouse events of the observed widget are filtered.

Parameters

object	Object to be filtered
event	Event

Returns: Forwarded to QObject::eventFilter()

See also: widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent() widgetKeyReleaseEvent()

void QwtMagnifier::getMouseButton	(	Qt::MouseButton &	button,
		Qt::KeyboardModifiers &	modifiers
	)		const

See also: setMouseButton()

void QwtMagnifier::getZoomInKey	(	int &	key,
		Qt::KeyboardModifiers &	modifiers
	)		const

Retrieve the settings of the zoom in key.

Parameters

key	Key code, see Qt::Key
modifiers	Keyboard modifiers

See also: setZoomInKey()

void QwtMagnifier::getZoomOutKey	(	int &	key,
		Qt::KeyboardModifiers &	modifiers
	)		const

Retrieve the settings of the zoom out key.

Parameters

key	Key code, see Qt::Key
modifiers	Keyboard modifiers

See also: setZoomOutKey()

bool QwtMagnifier::isEnabled ( ) const

Returns: true when enabled, false otherwise

See also: setEnabled(), eventFilter()

double QwtMagnifier::keyFactor ( ) const

Returns: Key factor

See also: setKeyFactor()

double QwtMagnifier::mouseFactor ( ) const

Returns: Mouse factor

See also: setMouseFactor()

QWidget * QwtMagnifier::parentWidget ( )

Returns: Parent widget, where the rescaling happens

const QWidget * QwtMagnifier::parentWidget ( ) const

Returns: Parent widget, where the rescaling happens

virtual void QwtMagnifier::rescale ( double factor )

protectedpure virtual

Rescale the parent widget

Parameters

factor Scale factor

Implemented in QwtPlotMagnifier.

void QwtMagnifier::setEnabled ( bool on )

En/disable the magnifier.

When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.

Parameters

on	true or false

See also: isEnabled(), eventFilter()

void QwtMagnifier::setKeyFactor ( double factor )

Change the key factor.

The key factor defines the ratio between the current range on the parent widget and the zoomed range for each key press of the zoom in/out keys. The default value is 0.9.

Parameters

factor Key factor

See also: keyFactor(), setZoomInKey(), setZoomOutKey(), setWheelFactor, setMouseFactor()

void QwtMagnifier::setMouseButton	(	Qt::MouseButton	button,
		Qt::KeyboardModifiers	modifiers = `Qt::NoModifier`
	)

Assign the mouse button, that is used for zooming in/out. The default value is Qt::RightButton.

Parameters

button	Button
modifiers	Keyboard modifiers

See also: getMouseButton()

void QwtMagnifier::setMouseFactor ( double factor )

Change the mouse factor.

The mouse factor defines the ratio between the current range on the parent widget and the zoomed range for each vertical mouse movement. The default value is 0.95.

Parameters

factor Wheel factor

See also: mouseFactor(), setMouseButton(), setWheelFactor(), setKeyFactor()

void QwtMagnifier::setWheelFactor ( double factor )

Change the wheel factor.

The wheel factor defines the ratio between the current range on the parent widget and the zoomed range for each step of the wheel.

Use values > 1 for magnification (i.e. 2.0) and values < 1 for scaling down (i.e. 1/2.0 = 0.5). You can use this feature for inverting the direction of the wheel.

The default value is 0.9.

Parameters

factor Wheel factor